Two men have been charged with terrorism and firearms offences after being stopped in Dover, Scotland Yard said on Sunday.
Mohommod Hassin Nawaz, 29, of Dirleton Road, Stratford, east London, and Hamza Nawaz, 22, of the same address, are accused of attending a terrorist training camp in Syria.
The pair were stopped by police at the Kent sea port after travelling from Calais in France, a Metropolitan Police spokesman said.
They will appear at Westminster Magistrates' Court tomorrow.
The brothers, believed to be of Pakistani origin, were stopped by police in the early hours of last Monday and were arrested on suspicion of being involved in the commission, preparation or instigation of acts of terrorism under the Terrorism Act.
They have both been charged with conspiring to attend "a place used for terrorist training knowing" and being in possession of a stash of rifle ammunition.
Mohommod Hassin Nawaz is also been charged with being in possession of a laptop computer containing "information of a kind likely to be useful to a person committing or preparing an act of terrorism".
Their arrests triggered raids on a property in east London, as well as two vehicles.
A 37-year-old man and a 36-year-old woman who were arrested on suspicion of terror offences in Essex on Wednesday have been released without charge.
Police also searched at a further address in east London and another in Lancashire but no arrests were made.